The ASQ Standards Team invites the public to submit technical questions regarding standards. Please be aware that the team will answer your questions by seeking guidance from volunteer experts. This may take a little while. On average, questions are answered within two or three weeks.

This document revises the NIOSH Standard Application Procedures for the Certification of. Respirators dated July 2005. This revision was written to clarify the approval process under Title. 42, Code of Federal Regulations (CFR) Part 84 (also known as 42 CFR 84) and to add the information concerning the.

Submit question by e-mailing the team. Here are some questions the Standards Team has answered in the past: 1Q: My question is pertinent to the ANSI/ASQ Z1.4-2003 Sampling standard. Can someone at ASQ tell me if there is a statistically significant difference between this ANSI/ASQ standard and C=0? Of these two standards is one preferable to the other and if so why? We wish to standardize our sampling methods in receiving inspection and need to understand the differences in these standards so that we can make an informed decision. 1A: There are major differences.

Z 1.4 is a sampling scheme and has single, double and multiple sampling plans. It employs the use of switching rules.

It does contain some C=0 plans. C=0 plans are one type or group of sampling plan that is generally used for critical characteristics.

2Q: How do I read ANSI Z1.4 standard? 2A: Read sections 1 through 11.6.3 on pages 1 through 8 of the standard.

Save 25% with Purchase of Both Standards The Z1.4 Standard ANSI/ASQ Z1.4-2003 (R2013): Sampling Procedures and Tables for Inspection by Attributes is an acceptance sampling system to be used with switching rules on a continuing stream of lots for Acceptance Quality Limit (AQL) specified. It provides tightened, normal, and reduced plans to be applied for attributes inspection for percent nonconforming or nonconformities per 100 units. • • • The Z1.9 Standard ANSI/ASQ Z1.9-2003 (R2013): Sampling Procedures and Tables for Inspection by Variables for Percent Nonconforming is an acceptance sampling system to be used on a continuing stream of lots for Acceptance Quality Limit (AQL) specified.

It provides tightened, normal, and reduced plans to be used on measurements which are normally distributed. Variation may be measured by sample standard deviation, sample range, or known standard deviation. It is applicable only when the normality of the measurements is assured. • • • History of Z1.4 & Z1.9 describing the origins and purposes of the statistical standards ANSI/ASQ Z1.4, which establishes for inspection by attributes, and ANSI/ASQ Z1.9, which establishes for inspection by variables.

Questions About Z1.4 and Z1.9? Ask the Experts! Visit the for help with your questions about the Z1.4 and Z1.9 standards. View previously answered questions on,. Training • • Featured Certification • • • Books • • • • Articles • “ Quality Engineering, January 2013 • “,” Quality Engineering, April 2013 • (members only), World Conference on Quality and Improvement, May 2009 • (members only), Quality Engineering, April 2009 • (members only), World Conference on Quality and Improvement, May 2010 •,” Quality Engineering, July 2006 •.